User authentication method and apparatus with adaptively updated enrollment database (DB)

Abstract

A method and apparatus with an adaptively updated enrollment database (DB) are provided. A method with an adaptively updated enrollment database (DB) includes extracting an input feature vector from an input image, determining whether the input feature vector is included in a changeable enrollment range, with the changeable enrollment range being determined based on a threshold distance from each of plural enrolled feature vectors in the enrollment DB, and with the enrolled feature vectors corresponding to enrolled images, determining whether to enroll the input feature vector in the enrollment DB in response to the input feature vector being determined as being included in the changeable enrollment range, and in response to a result of the determining of whether to enroll the input feature vector being to enroll the input feature vector, selectively enrolling the input feature vector in the enrollment DB.

What is claimed is: 
     
       1. A processor implemented method with an adaptively updated enrollment database (DB), the method comprising:
 extracting an input feature vector from an input image; 
 determining whether the input feature vector is included in a changeable enrollment range, by: calculating distances between the input feature vector and a plural enrolled feature vectors; determining whether the largest distance among the calculated distances is smaller than the maximum threshold distance; and determining whether the smallest distance among the calculated distances is larger than the minimum threshold distance; 
 determining whether to enroll the input feature vector in the enrollment DB in response to the input feature vector being determined as being included in the changeable enrollment range; and 
 in response to a result of the determining of whether to enroll the input feature vector being to enroll the input feature vector, selectively enrolling the input feature vector in the enrollment DB. 
 
     
     
       2. The method of  claim 1 , wherein the determining of whether to enroll the input feature vector in the enrollment DB comprises:
 in response to the largest distance being larger than the maximum threshold distance, excluding an enrollment of the input feature vector by determining the input feature vector as an outlier. 
 
     
     
       3. The method of  claim 1 , further comprising adjusting the changeable enrollment range by adjusting at least one of the maximum threshold distance or the minimum threshold distance.